San Francisco Giants teammates Madison Bumgarner and Buster Posey made MLB history Sunday against the Diamondbacks by becoming the first starting pitcher-catcher pair to ever hit grand slams in one game.

Posey struck first with a grand slam to deep left in the fifth inning to give the Giants a 4-1 lead.

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Bumgarner completed the second half of the feat in the next inning when he smacked a grand slam to left for an 8-1 lead. It was Bumgarner's second grand slam of the season. (He has two homers on the season, so he basically only hits grand slams.)